A pipe 30 cm long is open at both ends. Which harmonic mode of the pipe is resonantly excited by a 1.1 kHz source ? (Take speed of sound in air = 330 ms –1 )
Text Solution
Verified by ExpertsThe correct answer is:
B
According to the modes of vibration of air column in open organ pipe,
First mode of vibration
where 
frequency of vibration
v= speed of sound
I= length of organ pipe
The frequency of nth mode of vibration
Given, 
So, second harmonic mode of pipe resonates.
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